CN115774358A

CN115774358A - Liquid crystal display device and driving method

Info

Publication number: CN115774358A
Application number: CN202211465949.XA
Authority: CN
Inventors: 钟德镇; 姜丽梅
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-03-10

Abstract

The invention discloses a liquid crystal display device and a driving method, wherein the liquid crystal display device comprises a backlight module and a display panel; the display panel is provided with a plurality of first color sub-pixels, a plurality of second color sub-pixels and a plurality of transparent sub-pixels; the array substrate of the display panel is provided with a first scanning line, a second scanning line, a data line, a common electrode, a first thin film transistor, a second thin film transistor, a first pixel electrode and a second pixel electrode, wherein the first pixel electrode corresponds to the first color sub-pixels and the second color sub-pixels one by one, and the second pixel electrode corresponds to the transparent sub-pixels one by one; the backlight module comprises a red light source, a green light source and a blue light source. In the non-display time of each frame, the second pixel electrode can be discharged through the common electrode, so that poor color mixing caused by the high level of the second pixel electrode in the next frame is avoided, and the color purity is improved; the backlight module has three monochromatic light sources, and the color purity of display is further improved.

Description

Liquid crystal display device and driving method

Technical Field

The invention relates to the technical field of displays, in particular to a liquid crystal display device and a driving method.

Background

Liquid Crystal Display (LCD) devices have many advantages such as thin body, power saving, and no radiation, and are widely used. Such as: liquid crystal televisions, mobile phones, personal Digital Assistants (PDAs), digital cameras, computer screens, notebook computer screens, or the like, are dominant in the field of flat panel displays.

A conventional Liquid Crystal display panel includes a Color Filter (CF) Substrate, a Thin Film Transistor Array (TFT) Substrate, and a Liquid Crystal Layer (Liquid Crystal Layer) filled between the two substrates. The conventional liquid crystal display device implements color display by using color filters coated with color resistors of red, green, blue, etc. to filter monochromatic light (usually white light) provided by the backlight module. Usually, three sub-pixels of red, green and blue are arranged to form a pixel, and due to the filtering property of the color photoresist, the color filter can only allow 1/3 of the light to pass through, about 2/3 of the light is wasted by the color filter, and the light transmittance of the liquid crystal display panel is greatly lost.

In the prior art, in order to improve the display brightness, a brightness enhancement film is usually matched, but the cost and the thickness of the display panel are increased by additionally matching the brightness enhancement film; or, the RGBW architecture design, i.e. the red, green, blue and white sub-pixels are used to improve the transmittance, but the white sub-pixel may cause the color purity not to be high and the saturation to be reduced.

Disclosure of Invention

In order to overcome the disadvantages and shortcomings of the prior art, an object of the present invention is to provide a liquid crystal display device and a driving method thereof, so as to solve at least one problem of the prior art.

The purpose of the invention is realized by the following technical scheme:

the invention provides a liquid crystal display device, which comprises a backlight module and a display panel arranged on the light-emitting side of the backlight module;

the display panel comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a liquid crystal layer arranged between the color film substrate and the array substrate, and is provided with a plurality of first color sub-pixels, a plurality of second color sub-pixels and a plurality of transparent sub-pixels, wherein the first color sub-pixels are one of red sub-pixels, green sub-pixels or blue sub-pixels, and the second color sub-pixels are the other of the red sub-pixels, the green sub-pixels or the blue sub-pixels;

a color resistance layer is arranged in the region of the color film substrate corresponding to the first color sub-pixel and the second color sub-pixel, and the region of the color film substrate corresponding to the transparent sub-pixel is in a transparent state; the array substrate is provided with a plurality of first scanning lines, a plurality of second scanning lines, a plurality of data lines, a common electrode, a plurality of first thin film transistors, a plurality of second thin film transistors, a plurality of first pixel electrodes and a plurality of second pixel electrodes, the first pixel electrodes and the second pixel electrodes are electrically connected with the first scanning lines and the data lines adjacent to the first thin film transistors through the first thin film transistors, the second pixel electrodes are also electrically connected with the second scanning lines and the common electrodes adjacent to the second thin film transistors through the second thin film transistors, the first pixel electrodes are in one-to-one correspondence with the first colored sub-pixels and the second colored sub-pixels, and the second pixel electrodes are in one-to-one correspondence with the transparent sub-pixels;

the backlight module comprises a light emitting source and a light guide plate, wherein the light emitting source comprises a red light source, a green light source and a blue light source.

Further, the aperture ratio of the transparent sub-pixel is 1/3 of the aperture ratio of the first color sub-pixel or the second color sub-pixel.

The backlight module further comprises a first circuit board, the first circuit board is positioned on the side face of the light guide plate, the red light sources, the green light sources and the blue light sources are all arranged on the first circuit board, and the red light sources, the green light sources and the blue light sources are sequentially and alternately arranged on the first circuit board.

Furthermore, the number of the first circuit boards is one, and the first circuit boards are located on one side face of the light guide plate;

or the number of the first circuit boards is two, the first circuit boards are positioned on two opposite side surfaces of the light guide plate, and the red light sources, the green light sources and the blue light sources on the two first circuit boards are respectively aligned.

Further, the first color sub-pixel is a red sub-pixel, the second color sub-pixel is a green sub-pixel, and the red light source and the green light source are turned on or off simultaneously.

Furthermore, the backlight module comprises a first circuit board and a second circuit board, the red light source and the green light source are both arranged on the first circuit board, and the blue light source is arranged on the second circuit board.

Furthermore, a plurality of light guide dots are arranged on the light guide plate, and the distribution density of the light guide dots is gradually increased from one side of the light emitting source to one side far away from the light emitting source.

Furthermore, a whole shielding electrode is arranged on one side of the color film substrate facing the liquid crystal layer.

The present application also provides a driving method of a liquid crystal display device, the driving method being for driving the liquid crystal display device as described above, the driving method comprising:

controlling the liquid crystal display device to alternately display a first frame image and a second frame image, wherein the first frame image and the second frame image are overlapped to form a full-color image;

the driving time of the first frame image comprises a first display time and a first non-display time, and in the first display time, the light-emitting sources in the backlight module, which have the same color as the first color sub-pixel and the second color sub-pixel, are controlled to be turned on, and the light-emitting sources in the backlight module, which have the different color from the first color sub-pixel and the second color sub-pixel, are controlled to be turned off; applying corresponding first gray scale voltage to each of a plurality of first pixel electrodes through a data line, wherein the first color sub-pixels and the second color sub-pixels display corresponding gray scale brightness, no voltage signal or a black picture voltage signal is applied to a plurality of second pixel electrodes, and the transparent sub-pixels are in a black state;

the driving time of the second frame image comprises a second display time and a second non-display time, and in the second display time, the light-emitting sources in the backlight module, which have different colors from the first color sub-pixel and the second color sub-pixel, are controlled to be turned on, and the light-emitting sources in the backlight module, which have the same colors as the first color sub-pixel and the second color sub-pixel, are controlled to be turned off; the first pixel electrodes are not applied with voltage signals or are applied with black picture voltage signals, the first color sub-pixels and the second color sub-pixels are in a black state, corresponding second gray scale voltages are respectively applied to the second pixel electrodes through the data lines, and the transparent sub-pixels display corresponding gray scale brightness;

and in the first non-display time and the second non-display time, all the second scanning lines are opened, and a common voltage is applied to the second pixel electrodes through the common electrode.

Further, the refresh frequency of the first frame image and the second frame image is twice the refresh frequency of the full-color image.

The invention has the beneficial effects that: the transparent sub-pixels are arranged on the display panel, so that the penetration rate of the display panel to light rays is improved, and the display panel is ensured to have higher display color purity while the penetration rate of the display panel is improved by matching three monochromatic light sources of the backlight module; in addition, the array substrate is further provided with a second scanning line, a common electrode and a second thin film transistor, and the second pixel electrode corresponding to the transparent sub-pixel is electrically connected with the second scanning line and the common electrode close to the second thin film transistor through the second thin film transistor, so that the second pixel electrode can be discharged through the common electrode in the non-display time of each frame, the poor color mixing caused by the high level of the second pixel electrode in the next frame is avoided, and the color purity of the display panel is further improved.

Drawings

FIG. 1 is a schematic view of an LCD device in an initial state according to one embodiment of the present invention;

fig. 2 is a schematic plan view of an array substrate according to an embodiment of the invention;

fig. 3 is a schematic plan structure diagram of a color film substrate according to a first embodiment of the present invention;

FIG. 4 is a schematic plan view illustrating a backlight module according to an embodiment of the invention;

FIG. 5 is a second schematic plan view illustrating a backlight module according to a first embodiment of the present invention;

FIG. 6 is a third schematic plan view illustrating a backlight module according to a first embodiment of the present invention;

FIG. 7 is a waveform diagram of signals when the LCD device is driven according to one embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a liquid crystal display device displaying a first frame of image according to a first embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a liquid crystal display device displaying a second frame of image according to a first embodiment of the present invention;

FIG. 10 is a schematic diagram of a liquid crystal display device displaying a full-color image according to one embodiment of the present invention;

FIG. 11 is a diagram illustrating the transmittance of different sub-pixels to different light according to an embodiment of the present invention;

12a-12e are schematic diagrams of a color film substrate during a manufacturing process according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a second embodiment of the present invention, showing a liquid crystal display device in an initial state;

fig. 14 is a schematic plan view illustrating an array substrate according to a second embodiment of the present invention;

fig. 15 is a schematic plan view of a color filter substrate in a second embodiment of the present invention;

FIG. 16 is a schematic plan view illustrating a backlight module according to a second embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a second embodiment of the present invention, showing a first frame of an image displayed on a liquid crystal display device;

FIG. 18 is a schematic view of a second embodiment of a liquid crystal display device showing a second frame of images;

fig. 19 is a schematic view of a liquid crystal display device displaying a full-color image according to a second embodiment of the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects of the liquid crystal display device and the driving method according to the present invention will be made with reference to the accompanying drawings and preferred embodiments:

[ example one ]

Fig. 1 is a schematic structural diagram of a liquid crystal display device in an initial state according to a first embodiment of the invention. Fig. 2 is a schematic plan view of an array substrate according to an embodiment of the invention. Fig. 3 is a schematic plan view of a color filter substrate according to an embodiment of the invention. Fig. 4 is a schematic plan view illustrating a backlight module according to an embodiment of the invention. Fig. 5 is a second schematic plan view illustrating a backlight module according to a first embodiment of the invention. Fig. 6 is a third schematic plan view illustrating a backlight module according to a first embodiment of the invention. Fig. 7 is a signal waveform diagram of the liquid crystal display device during driving according to the first embodiment of the invention. Fig. 8 is a schematic structural diagram of a liquid crystal display device displaying a first frame image according to a first embodiment of the invention. Fig. 9 is a schematic structural diagram of the liquid crystal display device displaying the second frame image according to the first embodiment of the invention. Fig. 10 is a schematic diagram of a full-color image displayed by the liquid crystal display device according to the first embodiment of the invention. FIG. 11 is a schematic diagram illustrating transmittance of different sub-pixels to different light according to an embodiment of the invention. Fig. 12a-12e are schematic diagrams of a color film substrate during a manufacturing process according to an embodiment of the invention.

As shown in fig. 1 to fig. 6, a liquid crystal display device according to an embodiment of the invention includes a backlight module 50 and a display panel disposed on a light-emitting side of the backlight module 50.

As shown in fig. 3, the display panel has a plurality of first color sub-pixels P1, a plurality of second color sub-pixels P2 and a plurality of transparent sub-pixels P3, and the first color sub-pixels P1, the second color sub-pixels P2 and the transparent sub-pixels P3 are distributed in an array. The first color sub-pixel P1 is one of a red sub-pixel, a green sub-pixel or a blue sub-pixel, and the second color sub-pixel P2 is the other one of the red sub-pixel, the green sub-pixel or the blue sub-pixel, i.e., the first color sub-pixel P1 and the second color sub-pixel P2 are one of the red sub-pixel, the green sub-pixel or the blue sub-pixel, but the first color sub-pixel P1 and the second color sub-pixel P2 are different color sub-pixels. In this embodiment, the first color sub-pixel P1 is a red sub-pixel, and the second color sub-pixel P2 is a green sub-pixel.

The display panel comprises a color film substrate 10, an array substrate 20 arranged opposite to the color film substrate 10, and a liquid crystal layer 30 arranged between the color film substrate 10 and the array substrate 20. In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules, and the positive liquid crystal molecules have the advantage of fast response. As shown in fig. 1, in the initial state, the positive liquid crystal molecules in the liquid crystal layer 30 are in a lying posture substantially parallel to the color filter substrate 10 and the array substrate 20, that is, the long axis direction of the positive liquid crystal molecules is substantially parallel to the surfaces of the color filter substrate 10 and the array substrate 20. In practical applications, however, the positive liquid crystal molecules in the liquid crystal layer 30 may have a smaller initial pretilt angle with respect to the substrates, and the initial pretilt angle may be in a range of less than or equal to 10 °, that is: 0 to 10 degrees. Optionally, the alignment directions of the positive liquid crystal molecules on the side close to the color filter substrate 10 and the positive liquid crystal molecules on the side close to the array substrate 20 are antiparallel.

The color filter substrate 10 is provided with a color resist layer 12 and a Black Matrix (BM) 11 for spacing the color resist layer 12 on a side facing the liquid crystal layer 30. The color resist layers 12 correspond to the first color sub-pixels P1 and the second color sub-pixels P2, that is, each first color sub-pixel P1 corresponds to one color resist layer 12, and each second color sub-pixel P2 corresponds to one color resist layer 12. In this embodiment, the color resist layer 12 corresponding to the first color sub-pixel P1 is made of a red (R) color resist material, the color resist layer 12 corresponding to the second color sub-pixel P2 is made of a green (G) color resist material, and the color filter substrate 10 is in a transparent state in a region corresponding to the transparent sub-pixel P3, and may be filled with an insulating layer and an OC material, so as to form a red sub-pixel, a green sub-pixel, and a transparent sub-pixel P3, and adjacent sub-pixels are spaced apart from each other by the black matrix 11.

The whole surface of the shielding electrode 13 is arranged on one side of the color film substrate 10 facing the liquid crystal layer 30, the color resistance layer 12 and the black matrix 11 are covered by the shielding electrode 13, and the shielding electrode 13 can be used for shielding an external electric field and preventing the deflection of liquid crystal molecules in the liquid crystal layer 30 from being interfered. The side of the color filter substrate 10 facing the liquid crystal layer 30 is further provided with a flat layer 14 on the whole, the flat layer 14 covers the shielding electrode 13, and the flat layer 14 is made of an OC material, so that the region of the transparent subpixel P3 is filled, and the side of the color filter substrate 10 facing the liquid crystal layer 30 becomes flat.

As shown in fig. 12a to 12e, the color filter substrate 10 is manufactured as follows:

as shown in fig. 12a, a whole surface of a black material is covered on a color filter substrate 10, the black material is exposed and developed, so as to form a black matrix 11 with a pattern, a plurality of sub-pixel regions are defined, and then thermal curing is performed, wherein a curing parameter may be 230 ℃ for 30min; as shown in fig. 12b, a color filter substrate 10 is covered with a whole color resist material, for example, a red color resist material, a photoresist layer is formed on the red color resist material, the photoresist layer is exposed, developed and etched by using a mask, so as to form a color resist layer 12 corresponding to the first color sub-pixel P1, the remaining photoresist is stripped, and then thermal curing is performed, wherein the curing parameter may be 230 ℃ for 30min; as shown in fig. 12c, a color filter substrate 10 is covered with a whole color resist material, for example, a green color resist material, a photoresist layer is formed on the red color resist material, the photoresist layer is exposed, developed and etched by using a mask, so as to form a color resist layer 12 corresponding to the second color sub-pixel P2, the remaining photoresist is stripped, and then thermal curing is performed, wherein the curing parameter may be 230 ℃ for 30min; as shown in fig. 12d, the entire transparent metal layer is covered on the color filter substrate 10, and the transparent metal layer may not be etched, so that the transparent metal layer forms an entire shielding electrode 13; as shown in fig. 12e, the color filter substrate 10 is covered with an entire OC material layer, and the region corresponding to the transparent sub-pixel P3 is filled, so that the side of the color filter substrate 10 facing the liquid crystal layer 30 becomes flat. Finally, a PS (vertical column) can be formed on the color film substrate 10, thereby supporting the liquid crystal cell.

As shown in fig. 1 and 2, the array substrate 20 is provided with a plurality of first scan lines 1, a plurality of second scan lines 2, a plurality of data lines 3, a plurality of first thin film transistors 4, a plurality of second thin film transistors 5, a common electrode 21, a plurality of first pixel electrodes 22, and a plurality of second pixel electrodes 23. The first scanning lines 1 and the second scanning lines 2 are parallel to each other and extend transversely, the first scanning lines 1 and the second scanning lines 2 are arranged alternately, one first scanning line 1 and one second scanning line 2 are arranged between two rows of sub-pixels, namely, one first scanning line 1 and one second scanning line 2 are respectively arranged on two sides of each row of sub-pixels. The first pixel electrodes 22 correspond to the first color sub-pixels P1 and the second color sub-pixels P2 one by one, and the second pixel electrodes 23 correspond to the transparent sub-pixels P3 one by one, that is, each first color sub-pixel P1 corresponds to one first pixel electrode 22, each second color sub-pixel P2 corresponds to one first pixel electrode 22, and each transparent sub-pixel P3 corresponds to one second pixel electrode 23. The first pixel electrode 22 and the second pixel electrode 23 are electrically connected to the first scan line 1 and the data line 3 adjacent to the first thin film transistor 4 through the first thin film transistor 4, and the second pixel electrode 23 is also electrically connected to the second scan line 2 and the common electrode 21 adjacent to the second thin film transistor 5 through the second thin film transistor 5. Therefore, in the non-display time of each frame, all the second scan lines 2 are at the high level, the second thin film transistors 5 are turned on, and the second pixel electrodes 23 can be discharged through the common electrode 21, so that poor color mixing caused by the high level of the second pixel electrodes 23 in the next frame is avoided, and the color purity of the display panel is further improved. In this embodiment, the driving method of the array substrate 20 is column inversion. Of course, in other embodiments, the array substrate 20 may also adopt a row inversion or a dot inversion. The first scanning line 1 and the second scanning line 2 are respectively driven by different gate driving chips or gate driving circuits.

The thin film transistors (the first thin film transistor 4 and the second thin film transistor 5) comprise a grid electrode, an active layer, a drain electrode and a source electrode, the grid electrode and scanning lines (the first scanning line 1 and the second scanning line 2) are positioned on the same layer and are electrically connected, the grid electrode and the active layer are isolated through an insulating layer, the source electrode of the first thin film transistor 4 is electrically connected with the data line 3, the source electrode of the second thin film transistor 5 is electrically connected with the common electrode 21 through a first contact hole, and the drain electrode and pixel electrodes (the first pixel electrode 22 and the second pixel electrode 23) are electrically connected through a second contact hole.

Furthermore, the aperture ratio of the transparent sub-pixel P3 is 1/3 of the aperture ratio of the first color sub-pixel P1 or the second color sub-pixel P2, the aperture ratios of the first color sub-pixel P1 and the second color sub-pixel P2 are the same, that is, the area of each second pixel electrode 23 is 1/3 of the area of each first pixel electrode 22, and the area of each transparent region in the color filter substrate 10 is 1/3 of the area of each color resist layer 12. Since the color filter substrate 10 is not provided with the color resistor in the region of the transparent subpixel P3, light of the backlight module 50 can penetrate through the color filter substrate 10 without loss, and therefore, the transmittance of the color filter substrate 10 to backlight in the region of the transparent subpixel P3 is high, and the display of a color picture is formed by mixing red light, green light and blue light, and the aperture ratio of the transparent subpixel P3 is 1/3 of the aperture ratio of the first color subpixel P1 or the second color subpixel P2, which is beneficial to simplifying the setting of a liquid crystal driving program and a brightness control program of the backlight module 50, and can also effectively increase the pixel density of a display panel and improve the display quality.

As shown in fig. 1, the common electrode 21 is located at a different layer from the first and

second pixel electrodes

22 and 23 and is insulated and isolated by an insulating layer. The first pixel electrode 22 and the second pixel electrode 23 are located at the same layer, and the common electrode 21 may be located above or below the first pixel electrode 22 and the second pixel electrode 23 (the common electrode 21 is shown below the first pixel electrode 22 and the second pixel electrode 23 in fig. 1). Preferably, the common electrode 21 is a planar electrode disposed over the entire surface, and the first and

second pixel electrodes

22 and 23 are slit electrodes having a plurality of electrode bars to form a Fringe Field Switching (FFS) mode. Of course, in other embodiments, the common electrode 21 may be located on the same layer as the first pixel electrode 22 and the second pixel electrode 23, but they are insulated from each other, each of the first pixel electrode 22, the second pixel electrode 23 and the common electrode 21 may include a plurality of electrode stripes, and the electrode stripes of the first pixel electrode 22 and the second pixel electrode 23 and the electrode stripes of the common electrode 21 are alternately arranged to form an In-Plane Switching (IPS) mode.

As shown in fig. 1, a first polarizer 41 is disposed on a side of the color filter substrate 10 away from the liquid crystal layer 30, a second polarizer 42 is disposed on a side of the array substrate 20 away from the liquid crystal layer 30, and transmission axes of the first polarizer 41 and the second polarizer 42 are perpendicular to each other. For example, the transmission axes of the first polarizer 41 are all 0 °, and the transmission axis of the second polarizer 42 is 90 °.

The color film substrate 10 and the array substrate 20 may be made of glass, acrylic acid, polycarbonate, and other materials. The material of the common electrode 21, the first pixel electrode 22, and the second pixel electrode 23 may be Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), or the like.

As shown in fig. 1, the backlight module 50 includes a light source 51, a light guide plate 52 and a diffusion sheet 53, the light guide plate 52 is used for guiding the light emitted from the light source 51, and the diffusion sheet 53 is used for scattering the light emitted from the light guide plate 52, so that the light is uniformly emitted to the display panel. The light source 51 is a side-in light source and is disposed on a side surface of the light guide plate 52.

Further, as shown in fig. 4-6, a plurality of light guide dots 521 are disposed on the light guide plate 52, and the distribution density of the light guide dots 521 gradually increases from the side of the light source 51 to the side away from the light source 51, so as to ensure the uniformity of the light emitted from the light guide plate 52.

The light source 51 includes a red light source 511, a green light source 512, and a blue light source 513. The red light source 511 is a red LED and can emit red light, the green light source 512 is a green LED and can emit green light, and the blue light source 513 is a blue LED and can emit blue light, so that the liquid crystal display device has high display color purity. Three monochromatic light sources are arranged in the backlight module 50, and the common electrode 21 is matched to discharge the second pixel electrode 23 in the non-display time, so that the first frame image and the second frame image have high color purity, and the first frame image and the second frame image are overlapped to form a full-color image and have high color purity.

As shown in fig. 4, in one embodiment, the backlight module 50 includes a first circuit board 541 and a second circuit board 542, the red light source 511 and the green light source 512 are disposed on the first circuit board 541, the blue light source 513 is disposed on the second circuit board 542, the first circuit board 541 is used for controlling the red light source 511 and the green light source 512 to be turned on or turned off simultaneously, and the second circuit board 542 is used for controlling the blue light source 513 to be turned on or turned off simultaneously. The first circuit board 541 and the second circuit board 542 are respectively located on two adjacent side surfaces of the light guide plate 52, and the distribution density of the light guide dots 521 gradually increases from one side of the first circuit board 541 toward the side away from the first circuit board 541, and gradually increases from one side of the second circuit board 542 toward the side away from the second circuit board 542.

As shown in fig. 5 and fig. 6, in one embodiment, the backlight module 50 includes a first circuit board 541, the first circuit board 541 is located at a side surface of the light guide plate 52, the red light source 511, the green light source 512 and the blue light source 513 are all disposed on the first circuit board 541, the red light source 511, the green light source 512 and the blue light source 513 are alternately arranged on the first circuit board 541 in sequence, the first circuit board 541 is used for controlling the red light source 511, the green light source 512 and the blue light source 513 to be turned on or off, and of course, the first circuit board 541 can control the red light source 511 and the green light source 512 to be turned on or off simultaneously and control the blue light source 513 to be turned on or off individually. As shown in fig. 5, the number of the first circuit boards 541 is one, the first circuit boards 541 are located on one side surface of the light guide plate 52, and the distribution density of the light guide dots 521 gradually increases from one side of the first circuit boards 541 to a side away from the first circuit boards 541. As shown in fig. 6, the number of the first circuit boards 541 is two, the first circuit boards 541 are located on two opposite side surfaces of the light guide plate 52, the red light sources 511, the green light sources 512 and the blue light sources 513 on the two first circuit boards 541 are aligned respectively, that is, the red light source 511 on one of the first circuit boards 541 is aligned with the red light source 511 on the other first circuit board 541, the green light source 512 on one of the first circuit boards 541 is aligned with the green light source 512 on the other first circuit board 541, and the blue light source 513 on one of the first circuit boards 541 is aligned with the blue light source 513 on the other first circuit board 541. The distribution density of the light guide dots 521 gradually increases from one side of the first circuit board 541 to a side away from the first circuit board 541, that is, the distribution density of the light guide dots 521 gradually increases from the first circuit boards 541 at both sides to the middle.

and controlling the liquid crystal display device to alternately display a first frame image (a in FIG. 10) and a second frame image (b in FIG. 10), wherein the first frame image and the second frame image are superposed to form a full-color image.

As shown in fig. 7, 8 and 10, the driving time of the first Frame image (Frame 1) includes a first display time T1 and a first non-display time T2. In a first display time T1, controlling the light-emitting sources 51 in the backlight module 50 with the same color as the first color sub-pixel P1 and the second color sub-pixel P2 to be turned on, and controlling the light-emitting sources 51 in the backlight module 50 with the different color from the first color sub-pixel P1 and the second color sub-pixel P2 to be turned off; the data line 3 applies a corresponding first gray scale voltage to each of the first pixel electrodes 22, the first color sub-pixel P1 and the second color sub-pixel P2 display corresponding gray scale luminance, the second pixel electrodes 23 do not apply a voltage signal or apply a black picture voltage signal, and the transparent sub-pixel P3 is in a black state, so as to display a first frame image, the first frame image only has picture information of red R and green G, but does not have picture information of white W and blue B, thereby avoiding that the colors of red R and green G are diluted by white light or the colors of red R and green G and blue light are poor, and being difficult to achieve the requirement of high color mixing, thereby obtaining picture information of red R and green G with higher color purity.

As shown in fig. 7, 9, and 10, the driving time of the second Frame image (Frame 2) includes a second display time T3 and a second non-display time T4. In the second display time T3, the light sources 51 in the backlight module 50 with the color different from that of the first color sub-pixel P1 and the second color sub-pixel P2 are controlled to be turned on, and the light sources 51 in the backlight module 50 with the color same as that of the first color sub-pixel P1 and that of the second color sub-pixel P2 are controlled to be turned off; the plurality of first pixel electrodes 22 are not applied with voltage signals or applied with black picture voltage signals, the first color sub-pixel P1 and the second color sub-pixel P2 are both in a black state, corresponding second gray scale voltages are respectively applied to the plurality of second pixel electrodes 23 through the data line 3, the transparent sub-pixel P3 displays corresponding gray scale luminance, and thus a second frame image is displayed, the second frame image only has picture information of blue B and does not have picture information of white W, red R and green G, and therefore the problem that the color of blue B is diluted by white light or the color of blue B is mixed poorly with red light and green light is avoided, the requirement of high NTSC is difficult to achieve, and the picture information of blue B with higher color purity is obtained.

In the first non-display time T2 and the second non-display time T4, all the second scan lines 2 are at a high level, the second thin film transistors 5 are turned on, and a common voltage signal is applied to the plurality of second pixel electrodes 23 through the common electrode 21. Therefore, in the non-display time of each frame, the second pixel electrode 23 can be discharged through the common electrode 21, and the poor color mixing caused by the high level of the second pixel electrode 23 in the next frame is avoided, so that the color purity of the display panel is improved. Three monochromatic light sources are arranged in the backlight module 50, and the common electrode 21 is matched to discharge the second pixel electrode 23 in the non-display time, so that the first frame image and the second frame image both have high color purity, and the first frame image and the second frame image are overlapped to form a full-color image also having high color purity.

Specifically, as shown in fig. 7 and 8, during the first display time T1 of the first Frame image (Frame 1), the red light source 511 and the green light source 512 of the backlight module 50 apply the first backlight signal BL1, the first backlight signal BL1 is at a high level, the red light source 511 and the green light source 512 are controlled to be turned on, the blue light source 513 applies the second backlight signal BL2, the second backlight signal BL2 is at a low level, and the blue light source 513 is controlled to be turned off. Referring to fig. 2, the first scan line 1 sequentially scans from top to bottom, and applies a corresponding first gray scale voltage V1 to each of the plurality of first pixel electrodes 22 through the data line 3, as shown in fig. 8, the liquid crystal layer 30 corresponding to the red sub-pixel B and the green sub-pixel G is deflected, so that the first color sub-pixel P1 and the second color sub-pixel P2 display corresponding gray scale luminance; while no voltage signal or black image voltage signal is applied to the data line 3 corresponding to the second pixel electrode 23, the liquid crystal layer 30 corresponding to the transparent subpixel P3 is not deflected, and the transparent subpixel P3 is in a black state. In the first non-display time T2 of the Frame1, the second scan lines 2 sequentially scan from top to bottom, and the common electrode 21 applies a common voltage signal to the plurality of second pixel electrodes 23, so as to discharge the second pixel electrodes 23, thereby avoiding poor color mixing caused by the second pixel electrodes 23 being at a high level in the next Frame, and improving the color purity of the display panel.

As shown in fig. 7 and 9, during the second display time T3 of the second Frame image (Frame 2), the red light source 511 and the green light source 512 of the backlight module 50 apply the first backlight signal BL1, the first backlight signal BL1 is at a low level, the red light source 511 and the green light source 512 are controlled to be turned off, the blue light source 513 applies the second backlight signal BL2, the second backlight signal BL2 is at a high level, and the blue light source 513 is controlled to be turned on. Referring to fig. 2, the first scan line 1 scans from top to bottom sequentially, and applies a corresponding second gray scale voltage V2 to each of the plurality of second pixel electrodes 23 through the data line 3, as shown in fig. 9, the liquid crystal layer 30 corresponding to the transparent sub-pixel P3 deflects, and the bright sub-pixel P3 displays a corresponding gray scale luminance; the data line 3 corresponding to the first pixel electrode 22 is not applied with a voltage signal or is applied with a black image voltage signal, and the liquid crystal layer 30 corresponding to the first color sub-pixel P1 and the second color sub-pixel P2 is not deflected, so that the first color sub-pixel P1 and the second color sub-pixel P2 are in a black state. In the second non-display time T4 of the Frame2, the second scan lines 2 sequentially scan from top to bottom, and the common electrode 21 applies a common voltage signal to the plurality of second pixel electrodes 23, so as to discharge the second pixel electrodes 23, thereby avoiding poor color mixing caused by the second pixel electrodes 23 being at a high level in the next Frame, and improving the color purity of the display panel.

Similarly, the subsequent Frame3 (the third Frame) is used for driving and displaying the picture information of the first Frame image, namely, red R and green G, the Frame4 (the fourth Frame) is used for driving and displaying the picture information of the second Frame image, namely, blue B, and the first Frame image and the second Frame image are alternately displayed with each other so as to be overlapped to form a full-color image.

Further, the refresh frequency of the first frame image and the second frame image is twice the refresh frequency of the full-color image. For example, the refresh frequency of the full-color image is 60Hz, and the refresh frequency of the first frame image and the second frame image is 120Hz.

	Conventional RGB	This example RGW
			BL	White light BL	R、G、B LED
Rx	0.658	0.658
			Ry	0.315	0.315
Gx	0.285	0.285
			Gy	0.572	0.572
Bx	0.140	0.140
			By	0.074	0.074
Wx	0.307	0.307
			Wy	0.328	0.328
WY	27.4％	36.1％
			Delta WY	100％	131.85％

Referring to the above table and shown in FIG. 11, in FIG. 11: TR is the transmittance of the red sub-pixel to the wavelength of light, TB is the transmittance of the blue sub-pixel to the wavelength of light, TG is the transmittance of the green sub-pixel to the wavelength of light, and TW is the transmittance of the transparent sub-pixel to the wavelength of light. In the table: rx is a color gamut abscissa of red light, ry is a color gamut ordinate of red light, gx is a color gamut abscissa of green light, gy is a color gamut ordinate of green light, bx is a color gamut abscissa of blue light, by is a color gamut ordinate of blue light, wx is a color gamut abscissa of white light, wy is a color gamut ordinate of white light, and Wy is relative backlight luminance, that is, the relative backlight luminance of the conventional RGB display panel is 27.4%, and the relative backlight luminance of the RGW display panel in the present application is 36.1%, therefore, the present application has a luminance ratio of 131.85% relative to the conventional RGB display panel, that is, the luminance is improved By 31.85%, and has a better transmittance.

The specific calculation is as follows, for a fixed wavelength of light, the luminance-dependent stimulus values for R (red), G (green), and B (blue):

red sub-pixel area: yr (λ) = [ (y-bar) = (L-sum) × (CF-red) ]/L

Green sub-pixel area: yg (λ) = [ (y-bar) × (L-sum) [ (CF-Green) ]/L

Blue sub-pixel area: yb (lambda) = [ (y-bar) × (L-sum) × (CF-Blue) ]/L

Transparent sub-pixel region: yoc (λ) = [ (y-bar) × (L-sum) × (CF-oc) ]/L

Wherein the spectral tristimulus values are: the amount of three primary colors (R/G/B) needed to match the isoenergetic spectral colors. CIE1931 Standard chromaticity observer spectra of Red R, green G, blue B are tristimulus values in x-bar, y-bar, z-bar, respectively. L-sum: representative = BL × PL + LC, i.e., light emitted from the BL (backlight module 50) and emitted after passing through the display panel. The transmittance of red, green and Blue of the CF (color film substrate 10) at the single wavelength is represented by CF-red or CF-Green or CF-Blue, and the transmittance of white light at the transparent sub-pixels of the CF is represented by CF-oc. λ represents the wavelength of light of the corresponding color. L represents the total luminance of the emergent light of the backlight.

The luminance brightness of a single wavelength can be calculated from the above formula, and the total luminance in the visible light wavelength range of 380nm to 780nm, yr = YYr (λ) d, yg = YYg (λ) d, yb = YYb (λ) d, yoc = YYoc (λ) d, and the luminance stimulus value is Yw =1/3 (Yr + Yg + Yb) or Yw =1/3 (Yr + Yg + Yoc) for white light, according to the calculus.

According to the formula, the brightness of the frame emergent white picture provided by the invention can be improved by 31.85% compared with the brightness of the traditional RGB display panel, and the purposes of saving power consumption and saving energy are achieved.

[ example two ]

Fig. 13 is a schematic structural diagram of a liquid crystal display device in an initial state according to a second embodiment of the present invention. Fig. 14 is a schematic plan view of an array substrate according to a second embodiment of the invention. Fig. 15 is a schematic plan structure view of a color filter substrate according to a second embodiment of the present invention. Fig. 16 is a schematic plan view illustrating a backlight module according to a second embodiment of the invention. Fig. 17 is a schematic structural diagram of a liquid crystal display device displaying a first frame image according to a second embodiment of the present invention. Fig. 18 is a schematic structural diagram of the liquid crystal display device in the second embodiment of the invention when displaying the second frame image. Fig. 19 is a schematic view of a liquid crystal display device displaying a full-color image according to a second embodiment of the present invention. As shown in fig. 13 to 19, the liquid crystal display device and the driving method according to the second embodiment of the present invention are substantially the same as the liquid crystal display device and the driving method according to the first embodiment (fig. 1 to 11), except that in this embodiment, the display panel has a plurality of first color sub-pixels P1, a plurality of second color sub-pixels P2 and a plurality of transparent sub-pixels P3, and the first color sub-pixels P1, the second color sub-pixels P2 and the transparent sub-pixels P3 are distributed in an array. The first color sub-pixel P1 is a red sub-pixel, and the second color sub-pixel P2 is a blue sub-pixel.

The color filter substrate 10 is provided with a color resist layer 12 and a Black Matrix (BM) 11 for spacing the color resist layer 12 on a side facing the liquid crystal layer 30. The color resist layer 12 corresponds to the first color sub-pixel P1 and the second color sub-pixel P2, that is, each first color sub-pixel P1 corresponds to one color resist layer 12, and each second color sub-pixel P2 corresponds to one color resist layer 12. In this embodiment, the color resist layer 12 corresponding to the first color sub-pixel P1 is made of a red (R) color resist material, the color resist layer 12 corresponding to the second color sub-pixel P2 is made of a blue (B) color resist material, and the color filter substrate 10 is in a transparent state in an area corresponding to the transparent sub-pixel P3, and may be filled with an insulating layer and an OC material, so as to form a red sub-pixel, a green sub-pixel, and a transparent sub-pixel P3, where adjacent sub-pixels are spaced apart from each other by the black matrix 11.

As shown in fig. 13, the backlight module 50 includes a light source 51, a light guide plate 52 and a diffusion sheet 53, wherein the light source 51 includes a red light source 511, a green light source 512 and a blue light source 513, the light guide plate 52 is used for guiding the light emitted from the light source 51, and the diffusion sheet 53 is used for scattering the light emitted from the light guide plate 52, so that the light is uniformly emitted to the display panel. The light source 51 is a lateral light source and is disposed on a side surface of the light guide plate 52, the red light source 511 is a red LED and can emit red light, the green light source 512 is a green LED and can emit green light, and the blue light source 513 is a blue LED and can emit blue light, so that the liquid crystal display device has high display color purity.

Further, as shown in fig. 16, a plurality of light guide dots 521 are disposed on the light guide plate 52, and the distribution density of the light guide dots 521 gradually increases from the side of the light source 51 to the side away from the light source 51, so as to ensure the uniformity of the light emitted from the light guide plate 52.

In this embodiment, the backlight module 50 includes a first circuit board 541 and a second circuit board 542, the red light source 511 and the blue light source 513 are both disposed on the first circuit board 541, the green light source 512 is disposed on the second circuit board 542, the first circuit board 541 is used for controlling the red light source 511 and the blue light source 513 to be turned on or turned off simultaneously, and the second circuit board 542 is used for controlling the green light source 512 to be turned on or turned off simultaneously. The first circuit board 541 and the second circuit board 542 are respectively located on two adjacent side surfaces of the light guide plate 52, and the distribution density of the light guide dots 521 gradually increases from one side of the first circuit board 541 toward the side far away from the first circuit board 541, and gradually increases from one side of the second circuit board 542 toward the side far away from the second circuit board 542.

In other embodiments, the backlight module 50 includes a first circuit board 541, the first circuit board 541 is located at a side surface of the light guide plate 52, the red light sources 511, the green light sources 512 and the blue light sources 513 are all disposed on the first circuit board 541, the red light sources 511, the green light sources 512 and the blue light sources 513 are sequentially and alternately arranged on the first circuit board 541, and the first circuit board 541 is configured to control the red light sources 511, the green light sources 512 and the blue light sources 513 to be turned on or turned off. Of course, the first circuit board 541 may control simultaneous turning-on or turning-off of the red and blue

light sources

511 and 513 and separately control turning-on or turning-off of the green light source 512. The number of the first circuit boards 541 may be one, the first circuit boards 541 are located on one side surface of the light guide plate 52, and the distribution density of the light guide dots 521 gradually increases from one side of the first circuit boards 541 toward the side away from the first circuit boards 541. The number of the first circuit boards 541 may also be two, the first circuit boards 541 are located on two opposite side surfaces of the light guide plate 52, and the red light sources 511, the green light sources 512, and the blue light sources 513 on the two first circuit boards 541 are aligned, respectively, that is, the red light source 511 on one of the first circuit boards 541 is aligned with the red light source 511 on the other first circuit board 541, the green light source 512 on one of the first circuit boards 541 is aligned with the green light source 512 on the other first circuit board 541, and the blue light source 513 on one of the first circuit boards 541 is aligned with the blue light source 513 on the other first circuit board 541. The distribution density of the light guide dots 521 gradually increases from one side of the first circuit board 541 to a side away from the first circuit board 541, that is, the distribution density of the light guide dots 521 gradually increases from the first circuit boards 541 at both sides to the middle.

the liquid crystal display device is controlled to alternately display a first frame image (a in fig. 19) and a second frame image (b in fig. 19), and the first frame image and the second frame image are superimposed to form a full-color image.

As shown in fig. 7, 17, and 19, the driving time of the first Frame image (Frame 1) includes a first display time T1 and a first non-display time T2. In a first display time T1, controlling the light-emitting sources 51 in the backlight module 50 with the same color as the first color sub-pixel P1 and the second color sub-pixel P2 to be turned on, and controlling the light-emitting sources 51 in the backlight module 50 with the different color from the first color sub-pixel P1 and the second color sub-pixel P2 to be turned off; the data line 3 applies a corresponding first gray scale voltage to each of the first pixel electrodes 22, the first color sub-pixel P1 and the second color sub-pixel P2 display corresponding gray scale luminance, the second pixel electrodes 23 do not apply a voltage signal or apply a black picture voltage signal, and the transparent sub-pixel P3 is in a black state, thereby displaying a first frame image, wherein the first frame image only has picture information of red R and blue B, but does not have picture information of white W and green G, thereby avoiding that the colors of red R and blue B are diluted by white light or that the colors of red R and blue B and green light are poor, making it difficult to achieve a high color mixing requirement, and obtaining picture information of red R and blue B with higher color purity.

As shown in fig. 7, 18, and 19, the driving time of the second Frame image (Frame 2) includes a second display time T3 and a second non-display time T4. In the second display time T3, the light sources 51 in the backlight module 50 with different colors from the first color sub-pixel P1 and the second color sub-pixel P2 are controlled to be turned on, and the light sources 51 in the backlight module 50 with the same colors as the first color sub-pixel P1 and the second color sub-pixel P2 are controlled to be turned off; the plurality of first pixel electrodes 22 are not applied with voltage signals or applied with black image voltage signals, the first color sub-pixel P1 and the second color sub-pixel P2 are both in a black state, corresponding second gray scale voltages are respectively applied to the plurality of second pixel electrodes 23 through the data line 3, the transparent sub-pixel P3 displays corresponding gray scale luminance, and thus a second frame image is displayed, the second frame image only has image information of green G and does not have image information of white W, red R and blue B, and therefore the problem that the color of green G is diluted by white light or the color of green G is poorly mixed with red light and blue light is avoided, the requirement of high NTSC is difficult to achieve, and the image information of green G with higher color purity is obtained.

In the first non-display time T2 and the second non-display time T4, all the second scan lines 2 are at a high level, the second thin film transistors 5 are turned on, and a common voltage signal is applied to the plurality of second pixel electrodes 23 through the common electrode 21. Therefore, in the non-display time of each frame, the second pixel electrode 23 can be discharged through the common electrode 21, and the poor color mixing caused by the high level of the second pixel electrode 23 in the next frame is avoided, so that the color purity of the display panel is improved. Three monochromatic light sources are arranged in the backlight module 50, and the common electrode 21 is matched to discharge the second pixel electrode 23 in the non-display time, so that the first frame image and the second frame image have high color purity, and the first frame image and the second frame image are overlapped to form a full-color image and have high color purity.

Specifically, referring to fig. 7 and 17, during a first display time T1 of a first Frame image (Frame 1), the red light source 511 and the blue light source 513 of the backlight module 50 apply the first backlight signal BL1, the first backlight signal BL1 is at a high level, the red light source 511 and the blue light source 513 are controlled to be turned on, the green light source 512 applies the second backlight signal BL2, the second backlight signal BL2 is at a low level, and the green light source 512 is controlled to be turned off. Referring to fig. 2, the first scan line 1 sequentially scans from top to bottom, and applies a corresponding first gray scale voltage V1 to each of the plurality of first pixel electrodes 22 through the data line 3, as shown in fig. 17, the liquid crystal layer 30 corresponding to the red sub-pixel B and the blue sub-pixel B is deflected, so that the first color sub-pixel P1 and the second color sub-pixel P2 display corresponding gray scale luminance; while no voltage signal or black image voltage signal is applied to the data line 3 corresponding to the second pixel electrode 23, the liquid crystal layer 30 corresponding to the transparent subpixel P3 is not deflected, and the transparent subpixel P3 is in a black state. In the first non-display time T2 of the Frame1, the second scan lines 2 sequentially scan from top to bottom, and the common electrode 21 applies a common voltage signal to the plurality of second pixel electrodes 23, so as to discharge the second pixel electrodes 23, thereby avoiding poor color mixing caused by the second pixel electrodes 23 being at a high level in the next Frame, and improving the color purity of the display panel.

As shown in fig. 7 and 18, during the second display time T3 of the second Frame image (Frame 2), the red light source 511 and the blue light source 513 of the backlight module 50 apply the first backlight signal BL1, the first backlight signal BL1 is at a low level, the red light source 511 and the blue light source 513 are controlled to be turned off, the green light source 512 applies the second backlight signal BL2, the second backlight signal BL2 is at a high level, and the green light source 512 is controlled to be turned on. Referring to fig. 2, the first scan line 1 sequentially scans from top to bottom, and applies a corresponding second gray scale voltage V2 to each of the plurality of second pixel electrodes 23 through the data line 3, as shown in fig. 18, the liquid crystal layer 30 corresponding to the transparent sub-pixel P3 is deflected, and the bright sub-pixel P3 displays a corresponding gray scale luminance; while no voltage signal or black frame voltage signal is applied to the data line 3 corresponding to the first pixel electrode 22, the liquid crystal layer 30 corresponding to the first color sub-pixel P1 and the second color sub-pixel P2 is not deflected, so that the first color sub-pixel P1 and the second color sub-pixel P2 are in a black state. In the second non-display time T4 of the Frame2, the second scan line 2 scans from top to bottom sequentially, and applies a common voltage signal to the plurality of second pixel electrodes 23 through the common electrode 21, so as to discharge the second pixel electrodes 23, thereby avoiding poor color mixing caused by the second pixel electrodes 23 being at a high level in the next Frame, and improving the color purity of the display panel.

Similarly, the subsequent Frame3 is used for driving and displaying the picture information of the first Frame image, namely, red R and green G, the Frame4 is used for driving and displaying the picture information of the second Frame image, namely, blue B, and the first Frame image and the second Frame image are alternately displayed with each other so as to be overlapped to form a full-color image.

Of course, in another embodiment, the first color sub-pixel P1 may be a green sub-pixel, and the second color sub-pixel P2 may be a blue sub-pixel, and when displaying the first frame image, the first frame image only has screen information of green G and blue B, and when displaying the second frame image, the second frame image only has screen information of red R, and the first frame image and the second frame image are superimposed to form a full-color image, that is, the screen information of green G and blue B and the screen information of red R are superimposed to form a full-color image.

It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.

In this document, the terms of upper, lower, left, right, front, rear and the like are used to define the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the sake of clarity and convenience in technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The liquid crystal display device is characterized by comprising a backlight module (50) and a display panel arranged on the light-emitting side of the backlight module (50);

the display panel comprises a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10) and a liquid crystal layer (30) arranged between the color film substrate (10) and the array substrate (20), the display panel is provided with a plurality of first color sub-pixels (P1), a plurality of second color sub-pixels (P2) and a plurality of transparent sub-pixels (P3), the first color sub-pixels (P1) are one of red sub-pixels, green sub-pixels or blue sub-pixels, and the second color sub-pixels (P2) are the other of the red sub-pixels, the green sub-pixels or the blue sub-pixels;

a colored resist layer (12) is arranged in the region of the color film substrate (10) corresponding to the first colored sub-pixel (P1) and the second colored sub-pixel (P2), and the region of the color film substrate (10) corresponding to the transparent sub-pixel (P3) is transparent; the array substrate (20) is provided with a plurality of first scanning lines (1), a plurality of second scanning lines (2), a plurality of data lines (3), a plurality of first thin film transistors (4), a plurality of second thin film transistors (5), a common electrode (21), a plurality of first pixel electrodes (22) and a plurality of second pixel electrodes (23), the first pixel electrodes (22) and the second pixel electrodes (23) are electrically connected with the first scanning lines (1) and the data lines (3) which are close to the first thin film transistors (4) through the first thin film transistors (4), the second pixel electrodes (23) are also electrically connected with the second scanning lines (2) and the common electrodes (21) which are close to the second thin film transistors (5) through the second thin film transistors (5), the first pixel electrodes (22) correspond to the first colored sub-pixels (P1) and the second colored sub-pixels (P2), and the second pixel electrodes (23) correspond to the transparent sub-pixels (P3) one by one;

the backlight module (50) comprises a light emitting source (51) and a light guide plate (52), wherein the light emitting source (51) comprises a red light source (511), a green light source (512) and a blue light source (513).

2. The liquid crystal display device according to claim 1, wherein an aperture ratio of the transparent sub-pixel (P3) is 1/3 of an aperture ratio of the first color sub-pixel (P1) or the second color sub-pixel (P2).

3. The lcd apparatus of claim 1, wherein the backlight module (50) comprises a first circuit board (541), the first circuit board (541) is located at a side of the light guide plate (52), the red light source (511), the green light source (512) and the blue light source (513) are all disposed on the first circuit board (541), and the red light source (511), the green light source (512) and the blue light source (513) are alternately arranged on the first circuit board (541) in sequence.

4. A liquid crystal display device according to claim 3, wherein the number of the first circuit boards (541) is one, and the first circuit boards (541) are located on one side surface of the light guide plate (52);

or, the number of the first circuit boards (541) is two, the first circuit boards (541) are located on two opposite side surfaces of the light guide plate (52), and the red light sources (511), the green light sources (512) and the blue light sources (513) on the two first circuit boards (541) are respectively aligned.

5. The lcd device of claim 1, wherein the first color sub-pixel (P1) is a red sub-pixel, the second color sub-pixel (P2) is a green sub-pixel, and the red light source (511) and the green light source (512) are turned on or off simultaneously.

6. A liquid crystal display device according to claim 5, wherein the backlight module (50) comprises a first circuit board (541) and a second circuit board (542), the red light source (511) and the green light source (512) being arranged on the first circuit board (541), and the blue light source (513) being arranged on the second circuit board (542).

7. The LCD device according to any of claims 1-6, wherein the light guide plate (52) is provided with a plurality of light guide dots (521), and the distribution density of the light guide dots (521) is gradually increased from the side of the light source (51) to the side far away from the light source (51).

8. The lcd device according to any of claims 1 to 6, wherein the side of the color filter substrate (10) facing the liquid crystal layer (30) is provided with a full-surface shielding electrode (13).

9. A driving method of a liquid crystal display device, the driving method being for driving the liquid crystal display device according to any one of claims 1 to 8, the driving method comprising:

the driving time of the first frame image comprises a first display time (T1) and a first non-display time (T2), in the first display time (T1), a light emitting source (51) in a backlight module (50) with the same color as a first color sub-pixel (P1) and a second color sub-pixel (P2) is controlled to be turned on, and a light emitting source (51) in the backlight module (50) with the different color from the first color sub-pixel (P1) and the second color sub-pixel (P2) is controlled to be turned off; a corresponding first gray scale voltage is applied to each of the first pixel electrodes (22) through the data line (3), the first color sub-pixel (P1) and the second color sub-pixel (P2) display corresponding gray scale brightness, no voltage signal or a black picture voltage signal is applied to the second pixel electrodes (23), and the transparent sub-pixel (P3) is in a black state;

the driving time of the second frame image comprises a second display time (T3) and a second non-display time (T4), in the second display time (T3), a light emitting source (51) in the backlight module (50) with the color different from that of the first color sub-pixel (P1) and the second color sub-pixel (P2) is controlled to be turned on, and a light emitting source (51) in the backlight module (50) with the color same as that of the first color sub-pixel (P1) and that of the second color sub-pixel (P2) is controlled to be turned off; the first pixel electrodes (22) are not applied with voltage signals or applied with black picture voltage signals, the first color sub-pixel (P1) and the second color sub-pixel (P2) are in a black state, corresponding second gray scale voltages are applied to the second pixel electrodes (23) through the data lines (3), and the transparent sub-pixel (P3) displays corresponding gray scale brightness;

during the first non-display time (T2) and the second non-display time (T4), all the second scanning lines (2) are turned on, and a common voltage is applied to the plurality of second pixel electrodes (23) through a common electrode (21).

10. The driving method according to claim 9, wherein the refresh frequency of the first frame image and the second frame image is twice the refresh frequency of the full-color image.